Man donates kidney to girlfriend's dad

A US man has donated a kidney to his girlfriend's father after the man spent years battling ill health.

Andrew Mayzak, 23, who lives in New York with his girlfriend Ashley Turcotte, heard about Paul Turcotte's health problems from his daughter.

Mr Turcotte was undergoing hours of dialysis multiple times a week due to kidney disease, while still working to provide for his family.

"From there I did a little research for a couple of weeks, and I ended up telling her that I wanted to get tested to be a potential donor for her father," Mayzak told WHAM. "Then after about three or four months of testing to become a possible donor, I was approved that I was a match for her father."

Andrew says he would do it all again. (Supplied)

Ms Turcotte says she was "shocked" when Mayzak told her he wanted to donate a kidney to her father. They pair had only been dating for a short while after meeting online.

"I was shocked because I had no idea that this was what he was thinking or that he had thought about this," she said. "So once I got over the initial shock I was like, this is really great."

The family later shared their story on Good Morning America.

The pair wishing each other luck ahead of surgery. (Supplied)

Mr Turcotte said he has been struggling with kidney disease since he was a teenager and was diagnosed with IGA nephropathy in 2011. The condition, also known as Berger's disease, causes immunoglobulin to build up in the kidneys, requiring dialysis.

Paul and Andrew now work together to promote kidney donation. (Supplied)

He had been undergoing dialysis - the clinical purification of blood by dialysis, as a substitute for the normal function of the kidney - for four years when he received the good news Mayzak wanted to donate a kidney to him.

Andrew with Ashley and her father Paul. (Supplied)

"I thought it was like a dream, I really didn't know what to think, I was more concerned about his health than I was my own, I really was afraid for him," Mr Turcotte told WHAM of finding out his daughter's boyfriend was a match. "[I] was grateful he did that for me and basically saved my life."

The duo went through with the successful transplant surgeries on October 1.

Paul has been working during dialysis to provide for his family. (Supplied)

Mr Turcotte is recovering well and his daughter says it's been "really great" to see him getting healthier.

Mayzak said he would do it again, after watching his girlfriend, her father and her family suffer as a result of Mr Turcotte's health problems.

"I love her, and I would do anything for her family," he told WHAM. "I just wanted to make her family whole again after so many years on dialysis, it was difficult on her, her sister, her mum, the whole family."